T22P Speaker Muted after Firmware Upgrade?

[Navglyr]

James, thanks for the reply. I had forgotten about this post and should have edited it as I think I may have inadvertently discovered my issue after I posted this thread.

I have several of these phones, so I pulled one out that had not been upgraded or registered or otherwise molested. I plugged it into power (no network) and verified that the speaker functioned. I left it for 30 minutes, and when I came back, the speaker was no longer functioning. At that point, I realized the issue had to be related to power. Lo and behold, the power adapter I was using was 12v instead of 5v. And at that point, I felt like an idiot for not verifying the voltage prior to using the adapter. Thus, I'm guessing I fried something internally on three separate units. I've since ordered several OEM power supplies due to arrive tomorrow (for use with my remaining non-fried equipment, obviously).

Thanks again!